Problem 1 The demand for assembly S is 150 units at the start of week 6. Each un

Question

Problem 1

The demand for assembly S is 150 units at the start of week 6.

Each unit of S requires 2 units of T and 3 units of U. Each unit of T requires 2 units of V, 1 unit of W, and 4 units of X. Finally, each unit of U requires 3 units of Y and 1 unit of X.

One firm manufactures all items. It takes 1 week to make S, 2 weeks to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, and 2 weeks to make Y.

a) Construct a product structure tree at a lowest level coding (e.g. Identify all levels, parents, and components).

b) Prepare a time-phased product structure.

c) Construct a Materiel Requirements Plan (MRP) using the following on-hand inventory:

d) In addition to the 150 units of S at the start of week 6, there is also a demand of 50 units of U, which is a component of S. The 50 units of U are needed for maintenance purposes. These 50 units are needed at the start of week 4. Modify the MRP to reflect this change.

e) Is the MRP in part d) feasible? If it is not feasible provide a recommendation on how to make it feasible.

Item On hand inventory S 30 T 40 U 20 V 30 W 250 X 50 Y 80

Explanation / Answer

Item S is at level 0, made up of U and T so t&U are at level 1,

T requires V, W, X and U require Y, X therefore V, W, X, Y are at level 2

Solution to part (d)

Feasible with reducing the lead time for Y by 1 week or to have scheduled receipts for U or Y as per the requirements of additional 50 units at the end of period 4

Item name Level Lead time # per parent Onhand inventory S 1 1 30 T 1 2 2 40 V 2 2 2 30 W 2 3 1 250 X 2 1 4 10 U 1 2 3 20 X 2 1 1 20 Y 2 2 3 80

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